JPH0949235A - Slope execution method and anchor fixing pedestal making use thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an anchor fixing pedestal remarkably lightweight when it is conveyed and installed, to progress work quickly and easily and to hold stably the face of slope irrespective of unevennesses. SOLUTION: Underground fixture sectionS 5 of a plurality of ground anchors 4 are driven into the slope 3 formed by cutting off a bedrock 2, and anchor fixing pedestals 1 are installed to ground surface exposure sections of the ground anchors 4 while holding bags 8 between the bottomand slope ground 3a to temporarily fixed to the tensile members 6. After adjacent anchor fixing pedestals 1 are connected to each other, and the insides of them are filled with mortar from filler pouring holes. The bags 8 are also filled with mortar, and they are expanded to fill voids between the anchor fixing pedestals 1 and slope ground 3a. The bags 8 are not filled with mortar, and after the bags 8 are tightly closed and solidified, the anchor fixing pedestals 1 are completely fixed to the tensile members 6 to complete the ground anchors 4, and the stable slope 3 can be constructed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slope construction method for constructing a stable slope in slope construction such as cutting off a slope, and an anchor fixing pedestal used therefor.

[0002]

2. Description of the Related Art Conventionally, as a method for stabilizing a slope such as a steep slope that cuts out the ground or a slope where landslides are likely to occur,
A ground anchoring part of the ground anchor is placed on the slope, and a precast concrete block (hereinafter PC
There was a construction method for stabilizing the slope by fixing the block (abbreviated as “block”) and sequentially performing the same work from the upper stage to the lower stage of the slope (see Japanese Patent Publication No. 4-52812). However, in this conventional construction method, since the weight of the PC block is large, it is necessary to install the PC block on the slope using a large heavy machine such as a crane, and further support these with a crane or the like until the fixing is completed. It was troublesome and time consuming. Further, the work is extremely difficult in a place where the PC block cannot be carried in by a crane such as a high place where the crane cannot reach. In addition, when the unevenness of the slope ground is large, the contact between the PC block and the ground becomes uneven, and the bearing pressure that supports the slope as a ground anchor is transmitted in the form of concentrated load only at the contact area. The stability of holding was low, the slope could be loosened, and stress was concentrated on the PC block, which could lead to damage.

[0003]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to solve the above-mentioned problems and to greatly reduce the weight of the anchor fixing pedestal at the time of carrying in / installing, thereby making the work quick and easy. It is an object of the present invention to provide a slope surface construction method and an anchor fixing base used for the slope surface construction method that are advanced and can stably maintain the slope surface regardless of the unevenness of the slope ground.

[0004]

[Means for Solving the Problems] The constitution of the present invention which has solved the above problems is as follows: 1) Ground anchoring portions of ground anchors are formed at predetermined vertical and horizontal intervals on a slope formed by cutting natural ground, and the center is formed. A hole-shaped hollow anchor fixing pedestal with a hole for penetrating the ground anchor tensile member and a filler injection hole is temporarily fixed to each ground anchor ground surface portion of the slope to fix each anchor. Connect the bases to each other vertically and horizontally,
After filling the hardening material into the anchor fixing pedestal from each filling material injection hole, the anchor fixing pedestal and the ground anchor tensile member are completely fixed to form the ground anchor ground fixing section, and the slope is kept stable. 2) Insert the bag between the anchor anchoring pedestal and the slope ground, temporarily fix the anchor anchoring pedestal, and then connect the anchor anchoring pedestals to each other, and then in the anchor anchoring pedestal. And fill the bag with a hardening filler, expand the bag and fill the gap between the anchor anchoring base and the slope ground,
The slope mounting method described in 1) above, in which the anchor fixing pedestal and the tension member are completely fixed after the filling material in the bag is cured. 3) A hollow box-shaped hole through which the tension member of the ground anchor penetrates And a filling material injection hole are provided, the anchor fixing pedestal.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the method of constructing a slope according to the present invention, first, a ground fixing portion of a plurality of ground anchors is driven at predetermined intervals in vertical and horizontal directions on a slope made by cutting the ground, The tension member of the ground anchor is exposed on the ground surface. Next, a hollow box-shaped anchor anchoring pedestal provided with a hole for penetrating the tensile member in the central portion and having a filler injection hole was inserted into the ground surface portion of each ground anchor on the slope to penetrate the tensile member. It is installed in a closed state and temporarily fixed. As the anchor fixing base, a combination of steel materials having sufficient strength is mainly used. As the steel material, it is desirable to use a weather resistant steel material that is particularly resistant to corrosion. The anchor fixing pedestals temporarily fixed at the predetermined intervals are connected to the adjacent vertical and horizontal anchor fixing pedestals, and then the filler is injected from the filler injection holes. This filler contains
Mortar or concrete, which has the property of hardening, is used. Once the anchor fixing pedestal has been sufficiently filled with the filling material, the anchor fixing pedestal and the tension member that has passed through the hole are completely fixed while giving a predetermined tension force, and the ground anchor is used as the ground fixing section. Finalize.
By connecting the ground anchors with heavy anchor anchoring pedestals to each other at the anchor anchoring pedestal,
Slope can support the ground uniformly over a wide area, and can maintain a stable slope.

According to the method of sandwiching the bag between the anchor fixing pedestal and the slope ground, when the anchor fixing pedestal is installed on the ground surface portion of each ground anchor on the slope, the bag is placed between the anchor fixing pedestal and the slope ground. Sandwich it between. This bag combines flexibility and durability such as an anchor fixing pedestal and a woven cloth bag made of aramid fiber that has high strength that does not break even if high pressure is applied from the filling material filled inside. Use the material that you have. After the anchor fixing pedestals are temporarily fixed, the anchor fixing pedestals are connected to each other in the vertical and horizontal directions, and the filler is injected through the filler injection holes. At the same time, the same filling material is filled in the bag. The bag is inflated by the filling material and fills the gap between the anchor fixing pedestal and the sloped ground, which is caused by the unevenness of the sloped ground, and is in a state of strongly adhering to the pedestal bottom surface and the ground surface. When the inside of the bag reaches a predetermined pressure, the filling is stopped and the bag is sealed while maintaining the pressure. The filling material in the bag is cured while the pressure is maintained while the filling material is sufficiently filled in the anchor fixing pedestal. When the inside of the bag is completely hardened, the pedestal for anchor fixing and the tension member are completely fixed while giving a predetermined tension force to complete the ground anchor. The bearing pressure is evenly distributed and transmitted from the anchor fixing pedestal to the slope ground through the bag, and the slope can be held more stably.

[0007]

An embodiment of the present invention will be described with reference to the drawings.
The present embodiment is an example in which a bag that fills a gap is sandwiched between the anchor fixing base and the slope ground. FIG. 1 is an explanatory view showing a placement state of an underground fixing portion of a ground anchor in the embodiment, FIG. 2 is an explanatory view showing an anchor fixing base installation state in the embodiment, and FIG. 3 is a mortar filling work in the embodiment. Explanatory drawing, FIG. 4 is an explanatory view showing a slope after construction according to the embodiment, FIG. 5 is a plan view of an anchor fixing base used in the embodiment, and FIG. 6 is a front view of an anchor fixing base used in the embodiment. 7 is a sectional view taken along line AA of FIG.

Anchor fixing base 1 used in this embodiment
Is a hollow box made of steel having a cross shape in a plan view, the same vertical and horizontal dimensions of 2.9 m, and a height of 30 cm.
An anchor hole 1a for penetrating the tension member 6 of the ground anchor 4 is provided in the central portion, and a filler material injection hole 1b and connecting fittings 1c, 1d are provided on the side surface of the tip portion extending in a cross shape.
Is provided. The inside is partitioned by a partition plate 1e having holes, and is in a state of being reinforced by two steel rods 1f each vertically and horizontally. The anchor fixing pedestal 1 is made of a weather resistant steel material (for example, Corten manufactured by Nippon Steel Corporation) so that corrosion on the slope 3 does not easily occur.

In the slope construction method of the present embodiment, first, a plurality of ground anchors 4 are ground on a slope 3 which is formed by cutting a predetermined height from above the planned cutting portion of the slope 2a of the ground 2. The middle fixing section 5 is placed at intervals of about 3 m in length and width (see FIG. 1). After the driving, the adjustment block 7 is attached to the exposed surface of each ground anchor 4, and the anchor fixing base 1 is provided, and the bag 8 made of aramid fiber woven cloth is provided between the bottom surface and the slope ground 3a. Install it while sandwiching it so that the cross shape points vertically and horizontally (see Fig. 2). Anchor fixing base 1
Is temporarily fixed to the tension member 6 penetrating the anchor hole 1a so as not to move on the slope 3. The anchor fixing pedestals 1 that are vertically and horizontally adjacent to each other are connected to each other by engaging the connecting fittings 1c and 1d with the bolts 11 to support the slope 3 in an integrated state. After that, the mortar 12 is injected from the filler injection hole 1b of each anchor fixing pedestal 1 by the injection device 13 and is filled inside to increase the weight of the anchor fixing pedestal 1. Similarly, the mortar 12 is pressed into the bag 8 between the bottom surface of the anchor fixing pedestal 1 and the slope ground 3a by the press-fitting device 14 to expand the bag 8. The expanded bag 8 fills the space between the bottom surface of the anchor fixing base 1 and the slope ground 3a without any gap, and the upper and lower surfaces of the bag 8 are in close contact with the bottom surface of the anchor fixing base 1 and the surface of the slope ground 3a, respectively. (See Figure 3). After this, bag 8
When the inside reaches a predetermined pressure, the filling by the press-fitting device 14 is stopped, and the bag 8 is sealed while keeping the internal pressure of the bag 8 and cured as it is. When the mortar 12 in the bag 8 is completely hardened, the anchor fixing base 1 is completely fixed while applying a predetermined tension force to the tension member 6 through the fixing tool 9, and the ground fixing portion 4a of the ground anchor 4 is formed. Then, the ground anchor 4 is completed. By hardening the mortar 12 in the anchor fixing pedestal 1, the ground fixing portion 4a of the ground anchor 4 is strong and has both weight and strength. The weight of the anchor fixing pedestal 1 and the bearing pressure of the ground anchor 4 on the slope 3 are uniformly transmitted from the bottom surface of the anchor fixing pedestal 1 to the slope ground 3a via the bag 8, so that the slope 3 is strongly stabilized. Can be held at

When all the ground anchors 4 are fixed and completed and a stable slope 3 can be constructed, the lower stage next to the part to be cut off of the natural ground 2 is cut off, and the slope 3 of the second stage is cut in the same manner as above.
By constructing and then repeating this, it is possible to construct a stable slope 3 to the lowermost stage.

The anchor fixing pedestal 1 can be installed and fixed in a state where weather resistance and corrosion resistance are improved by applying a color tone suitable for the surrounding environment. Further, after the slope 3 is constructed, the anchor fixing pedestals 1 in the connected state may be collectively coated.

[0012]

According to the present invention, by adopting the above-described method, the anchor fixing base can be moved in a lightweight state at the time of carrying in and installing, and the carrying in / installing at the work site without using a large heavy machine such as a crane. Can be performed easily and smoothly, the burden on the operator can be reduced, and the working time can be shortened. In addition, workability in places where it was difficult to work, such as in high places, is greatly improved, the places where stable slope construction is possible can be widened, and the ground can be reliably protected.

By adopting a method of inserting a bag between the anchor fixing base and the slope ground, even if the slope ground has irregularities,
Through the inflated bag, the bearing pressure is evenly transmitted from the bottom surface of the anchor fixing pedestal to the slope ground below the bottom surface, so that the slope can be stably held, and the reliability of the slope is greatly improved.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a driving state of an underground fixing portion of a ground anchor in an embodiment.

FIG. 2 is an explanatory diagram showing an anchor fixing pedestal installed state in the embodiment.

FIG. 3 is an explanatory diagram showing a mortar filling operation in an example.

FIG. 4 is an explanatory diagram showing a slope after construction according to an embodiment.

FIG. 5 is a plan view of an anchor fixing base used in the embodiment.

FIG. 6 is a front view of a base for anchor fixing used in an example.

7 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1 Anchor fixing pedestal 1a Anchor hole 1b Filler injection hole 1c Connecting fitting 1d Connecting fitting 1e Partition plate 1f Steel rod 2 Ground 2a Slope 2b Cutting step 3 Slope 3a Slope ground 4 Ground anchor 4a Ground fixing part 5 Underground Fixing part 6 Tensile member 7 Adjustment block 8 Bag 9 Fixing tool 10 Cap 10a Waterproof filler 11 Bolt 12 Mortar 13 Injection device 13a Injection pipe 14 Press-fitting device 14a Press-fitting pipe

Claims (3)

[Claims] 1. A ground anchoring portion of a ground anchor is formed at predetermined vertical and horizontal intervals on a slope formed by cutting a ground, and a hole through which a tensile member of the ground anchor penetrates is provided in a central portion and a filler. A box-shaped hollow anchor anchoring pedestal with injection holes is temporarily fixed to each ground anchor ground surface on the slope, and each anchor anchoring pedestal is connected vertically and horizontally to anchor anchoring from each filler injection hole. A slope construction method in which after filling a hardening filler into the pedestal, the anchor fixing pedestal and the tension members of the ground anchor are completely fixed to form the ground anchor ground fixing portion, and the slope is stably maintained. 2. A bag is sandwiched between the anchor fixing pedestal and the slope ground, the anchor fixing pedestal is temporarily fixed, and the anchor fixing pedestals are connected to each other, and then in the anchor fixing pedestal and in the bag. A method for filling an anchor fixing pedestal and a tension member completely after the filling material in the bag is filled by filling a hardening filler and expanding the bag to fill a gap between the anchor fixing pedestal and the slope ground. The slope construction method described in 1. 3. An anchor fixing base characterized by having a hollow box shape, having a hole through which a tensile member of a ground anchor penetrates in a central portion, and having a filler injection hole.